lugers arnt a highly sort after gun, so not a great deal of companys make them, less ppl buy them, and so i have no idea about the quality/consistency of lugers.
the 1911s on the other hand, tons of people make them, with western arms even making a couple 1911s with fully legal and trademarks. But for all that you do pay a fair ammount extra.
For a 1911 thats cheap and full metal you can get a WE one, but im not sure of any UK company that sells them, so if your desperate for a cheap 1911 thats metal yourll have to import one from WGC shop (amazing airsoft shop in hong kong, its the main source of airsoft stuff, most retailers buy from WGC to sell on).
If you just want the 1911 lock, and are willing to compromise a bit, you could go for a para ordinance like the one at the bottom of
this page, or a Hi-Capa like one of the ones
here.
The hi-capa (aka a 2011) is similar to a 1911 but wider (double stack mag instead of single stack), and is a bit different in style, but its closer to a 1911 then a hfc m190, and its cheaper (under £100) but unfortunatly isnt full metal.
the para ordinance on the other hand is a little more expensive at £104, but its full metal, and proberly slightly closer to a 1911 then the hi-capa.